Novelist-screenwriter Eric (6)
I believe the answer is:
ambler
'novelist-screenwriter eric' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ambler that I've seen before include "one moving slowly" , "English thriller writer; walker" , "Fast-paced thriller writer? Yes" , "Leisurely walker" , "Eric, thriller writer" .)